oA THEORY OF STATISTICS. 
indicate equally clearly the tendency to resemblance between 
father and son. 
Example viii. —Association between inoculation against cholera 
and exemption from attack, five separate epidemics (cf. Example 
v., data from Tables IX., X., XXVIII, XXIX,, XXXI. of 
reference 6). 
Not Attacked. Attacked. Total. 
Inoculated 192 4 196 
Not inoculated . 113 34 147 
Total . 305 38 343 
Not Attacked. Attacked. Total. 
Inoculated 5,751 Cr 5,778 
Not inoculated . 6,351 198 6,549 
Total . 12,102 225 12,327 
Not Attacked. Attacked. Total. 
Inoculated 4,087 5 4,092 
Not inoculated . 113,856 1,144 115,000 
Total . . 117,943 1,149 119,092 
Not Attacked, Attacked. Total. 
Inoculated . 8,332 8 8.340 
Not inoculated 84,444 556 85,000 
Total . . 92,776 564 93,340 
Not Attacked. Attacked. Total. 
Inoculated 4.870 5 4,875 
Not inoculated 153,096 904 154,000 
Total . 157,966 909 158,875 
With the table of Example v. the above give data for six 
separate epidemics, in all of which the same method of inocula- 
Ra